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Low dimensional nanostructures have drawn tremendous interest owing to their remarkable electrical, optical, and mechanical properties, which can be used for novel electronics, energy approaches, and size/power efficient applications. Examples include quantized electrical conduction in single molecules (zero-dimension)/ semiconducting nanotubes (one-dimension). Additionally, nanotubes have been shown to have high mechanical stiffness/resilience, anisotropic optical absorption due to their one-dimensional morphology. Such aspects were investigated in detail in this thesis. In Chapter 1, a brief introduction to molecular electronics and the properties of single molecules such as Mn12 Acetate, and linear structures such as carbon nanotubes and their applications are addressed. The quantized electrical transport behavior and its optical dependence, of Mn12 Acetate have been studied through novel electro-migration assisted nano-junctions in Chapter 2. In Chapter 3, a comprehensive study of the synthesis of carbon nanotubes (CNTs) using thermal chemical vapor deposition (TCVD) is presented. The characterization in terms of nanotube length and quality were compared, as a function of synthesis temperature, gas mixture, types of substrate, etc., and a growth mechanism was then determined. An improved synthesis procedure was successfully proposed based on the study. In Chapter 4, the electrical transport behavior of SWCNTs, functionalized with different molecules (e.g., dodecyl, phenyl groups), were compared and investigated. The doping effects from those covalently bonded functional groups were manifested in the change in transport properties (e.g., p-, n-type, or metallic). The flexural rigidities (EIs) of MWCNT bundles were investigated through optical methods including laser transmission measurement and imaging techniques, in Chapter 5. The deflections of CNT bundles under fluid flow were monitored in situ and the flexural rigidities derived from the measured deflection through modified Stokes-Oseen formalisms. The potential of a CNT based gas flow sensor was demonstrated. In Chapter 6, the anisotropic optical absorption properties of MWCNTs were investigated and the absorption cross-sections, considering the misalignment of nanotube mats, were calculated and compared to those from SWCNTs. The nanotube diameter dependence of the optical absorption anisotropy was also studied. Chapter 7 summarizes the thesis.
A new window to local studies of interface phenomena at solid state surfaces has been opened by the development of local probe techniques such as Scanning Tunneling Microscopy (STM) or Atomic Force Microscopy (AFM) and related methods during the past fifteen years. The in-situ application of local probe methods in different systems belongs to modern nanotechnology and has two aspects: an analytical aspect and a preparative aspect. The first aspect covers the application of the local probe methods to characterize thermodynamic, structural and dynamic properties of solid state surfaces and interfaces and to investigate local surface reactions. Two methods which are still in the beginning of their development represent the second aspect: tip and cantilever. They can be used to form defined nano-objects such as molecular or atomic clusters, quantum dots etc. as well as to structure or modify solid state surfaces in the nanometer range. This IUPAC monograph is a comprehensive treatment of both aspects and presents the current state of knowledge. It is written for scientists active in the area of nanotechnology.
One-Dimensional Nanostructures: Electrospinning Technique and Unique Nanofibers is a comprehensive book depicting the electrospinning technique and related 1D unique electrospun nanofibers. The first part of the book focuses on electrospinning technique, with chapters describing Electrospinning setup, electrospinning theories, and related working parameter. The second part of the book describes in detail specific topics on how to control the electrospun fiber properties such as how to control the fiber direction, how to control the fiber surface morphology, how to control the fiber structure, and how to construct 3D structures by electrospun fibers. The final part of the book depicts the applications of the electrospun nanofibers, with sections describing in detail specific fields such as electrospun nanofiber reinforcement, filtration, electronic devices, lithium-ion batteries, fuel cells, biomedical field, and so on. One-Dimensional Nanostructures: Electrospinning Technique and Unique Nanofibers is designed to bring state-of-the-art on electrospinning together into a single book and will be valuable resource for scientists in the electrospinning field and other scientists involved in biomedical field, mechanical field, materials, and energy field. Dr. Zhenyu Li is an associate professor at the Dept. of Chemistry, Jilin University, Changchun, P. R. China. Currently, he also holds the position in Australian Future Fibres Research & Innovation Centre, Institute for Frontier Materials, Deakin University, Geelong, Victoria, Australia. Dr. Ce Wang is a professor at the Dept. of Chemistry, Jilin University, Changchun, P. R. China.
Third volume of a 40volume series on nanoscience and nanotechnology, edited by the renowned scientist Challa S.S.R. Kumar. This handbook gives a comprehensive overview about Transmission electron microscopy characterization of nanomaterials. Modern applications and state-of-the-art techniques are covered and make this volume an essential reading for research scientists in academia and industry.
Reviews the latest research breakthroughs and applications Since the discovery of carbon nanotubes in 1991, one-dimensional nanostructures have been at the forefront of nanotechnology research, promising to provide the building blocks for a new generation of nanoscale electronic and optoelectronic devices. With contributions from 68 leading international experts, this book reviews both the underlying principles as well as the latest discoveries and applications in the field, presenting the state of the technology. Readers will find expert coverage of all major classes of one-dimensional nanostructures, including carbon nanotubes, semiconductor nanowires, organic molecule nanostructures, polymer nanofibers, peptide nanostructures, and supramolecular nanostructures. Moreover, the book offers unique insights into the future of one-dimensional nanostructures, with expert forecasts of new research breakthroughs and applications. One-Dimensional Nanostructures collects and analyzes a wealth of key research findings and applications, with detailed coverage of: Synthesis Properties Energy applications Photonics and optoelectronics applications Sensing, plasmonics, electronics, and biosciences applications Practical case studies demonstrate how the latest applications work. Tables throughout the book summarize key information, and diagrams enable readers to grasp complex concepts and designs. References at the end of each chapter serve as a gateway to the literature in the field. With its clear explanations of the underlying principles of one-dimensional nanostructures, this book is ideal for students, researchers, and academics in chemistry, physics, materials science, and engineering. Moreover, One-Dimensional Nanostructures will help readers advance their own investigations in order to develop the next generation of applications.
This book includes updated theoretical considerations which provide an insight into avenues of research most likely to result in further improvements in material performance. It details the latest techniques for the preparation of thermoelectric materials employed in energy harvesting, together with advances in the thermoelectric characterisation of nanoscale material. The book reviews the use of neutron beams to investigate phonons, whose behaviour govern the lattice thermal conductivity and includes a chapter on patents.